Debt (Schedule of Applicable Interest Rates on Variable-rate Debt) (Details) - USD ($) $ in Millions		Sep. 29, 2023	Dec. 30, 2022
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Total Debt		$ 3,892.0	$ 3,092.6
Debt Instrument, Face Amount			3,534.1
Fixed-rate instruments
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		10.54%
Total Debt		$ 1,795.2
2017 Replacement Term Loan
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	[1]	11.94%
Total Debt			1,222.1
Debt Instrument, Face Amount		$ 1,356.7	1,374.1
2018 Replacement Term Loan
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	[1]	12.19%
Total Debt			326.9
Debt Instrument, Face Amount		$ 360.1	364.8
Debtor-In-Possession Financing
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		13.44%
Total Debt			0.0
Debt Instrument, Face Amount		$ 280.0	$ 0.0
Receivables Financing Facility
Schedule of Applicable Interest Rate on Variable-rate Debt [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		8.75%
Debt Instrument, Face Amount		$ 100.0

[1] Includes the impact of the interest rate cap agreement, which is discussed further in Note 13.